261440712 has 48 divisors (see below), whose sum is σ = 762538140. Its totient is φ = 80443008.

The previous prime is 261440689. The next prime is 261440801. The reversal of 261440712 is 217044162.

261440712 is a `hidden beast` number, since 2 + 614 + 40 + 7 + 1 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 188952516 + 72488196 = 13746^2 + 8514^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138723 + ... + 140594.

Almost surely, 2^261440712 is an apocalyptic number.

It is an amenable number.

261440712 is an abundant number, since it is smaller than the sum of its proper divisors (501097428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261440712 is a wasteful number, since it uses less digits than its factorization.

261440712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279342 (or 279335 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 261440712 is about 16169.1283624072. The cubic root of 261440712 is about 639.4271501682.

Adding to 261440712 its reverse (217044162), we get a palindrome (478484874).

The spelling of 261440712 in words is "two hundred sixty-one million, four hundred forty thousand, seven hundred twelve".